Noninductive twisted-wire resistor

ABSTRACT

A noninductive resistor is provided which includes supply and return insulated wires twisted together with one end each having the wires integrally connected and the other ends including respective electrical terminals. Part of the insulation may be removed so that a contact arm may slide therealong for resistor adjustment. The twisted resistor may be wound around a toroidal base for use.

United States atet [191 Kobayashi NONINDUCTIVE TWISTED-WIRE RESISTOR [75] Inventor: Tatsuo Kobayashi, Yokohama,

Japan [73] Assignee: E. R. D. Corporation, Tokyo, Japan [22] Filed: Mar. 26, 1970 [21] Appl. No.: 22,800

[30] Foreign Application Priority Data Mar. 27, 1969 Japan ..44/22736 [52] US. Cl. ..338/63, 338/143, 338/208, 338/298 [51 Int. Cl. ..H0lc 3/02 [58] Field of Search .l ..338/61, 62, 63, 79,

[56] References Cited UNITED STATES PATENTS 2,953,761 9/1960 Cothen ..338/143 1 51 Apr. 10, 1973 9/1934 Parrot ..338/63 4/1926 Adams ..338/63 Primary Examiner-Benjamin A. Borchelt Assistant Examiner-R. Kinberg Attorney-Burgess, Ryan and Hicks [5 7] ABSTRACT A noninductive resistor is provided which includes supply and return insulated wires twisted together with one end each having'the wires integrally connected and the other ends including respective electrical terminals. Part of the insulation may be removed so that a contact arm may slide therealong for resistor adjustment The twisted resistor may be wound around a toroidal base for use.

3 Claims, 3 Drawing Figures NONINDUCTIVE TWISTED-WIRE RESISTOR BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistor that is wound and more particularly a noninductive twistedwire resistor.

2. Description of the Prior Art The general use of noninductive resistors of the SUMMARY OF THE INVENTION One of the objects of the present invention is therefore to provide a noninductive resistor with an exceedingly less amount of inductance.

Another object of the present invention is to provide a noninductive resistor which can be manufactured by a very simple method.

The above and other objects, features and advantages of the present invention will become more apparent from the following description of some preferred embodiments thereof with reference to the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING F161 is a schematic view of one embodiment of the present invention; I

FIG.2 is a perspective view of another embodiment of the present invention; and

FIG.' 3 is for explanation of the application of the present invention with an adjustable resistor.

DESCRIPTION OF THE PREFERRED EMBODIMENT A length ofinsulatively coated resistance element 1 is folded back at its midpoint 2 and the element is v twisted with a suitable pitch. Both ends 3 and 4 serve as length of resistor wire element having its surface electrically insulatively treated and twisting together the doubled back wire elements, one for a supply line and the other for a return line. The noninductive resistor of the present invention may be used in the as-twistedstate if required, but generally it is wound around a bobbin or the like.

In the case where the twisted-wire resistor is wound around the bobbin, both of the supply and return lines have the same pitch and the distribution of the winding is uniform, so that the manufacture of the resistor of the present invention is much facilitated. Suitable capacity between the lines and suitable distributed capacity may be determined by suitably selecting an insulating material applied upon the surface of the wire element, its thickness, a twisting pitch, a method of winding, etc. so that a resistor having a desired frequency characteristic may be obtained in a simple manner.

It must be especially noted that according to the present invention the flux caused by the current flowing through the supply line may be readily cancelled by that caused by the current through the return line. The experiments shows that the resistors having an inductance of from one-fifth to one-tenth of that of the conventional noninductive resistor were conveniently obtained in a simple manner.

When the twisted-wire resistor of the present invention is wound into a spiral form, a honey-comb-like winding is obtained so that a distributed capacity is exceedingly reduced. When the twisted-wire resistor of the present invention is wound into a honey-comb winding, a distribution capacity is further reduced in more effective manner so that the usable frequency may be much increased.

In order to apply the present invention into an adjustable resistor, the insulating coating of the resistor is uncovered along one side thereof so that a sliding arm may slide in contact with the short-circuit portions between the supply and return lines along this uncovered side.

terminals. Alternatively, the ends of two lengths of resistance elements are joined together by soldering, brazing, etc. and the resistance elements are twisted together with a suitable pitch with the other ends providing the terminals.

A twisted resistor which is wound as shown in FIG.1 may be mounted upon a suitable insulating base (not shown) if this arrangement is desired for the use. But in many cases, the twisted resistor is wound in toroidal form around an insulating bobbin 5 as shown in F162.

In order to apply the twisted resistor of the present invention as an adjustable resistor, the insulating coating along the lower side edge of the twisted resistor is removed as very schematically shown in FIG.3 so that a sliding arm 6 may slide in contact with the exposed portion of the twisted resistor. When the twisted resistor is wound around the bobbin 5 as shown in FIG.2, the insulating coating portions upon the upper surface 7 of the bobbin 5 may be removed so that a suitable sliding arm may slide over the upper surface 7 in contact with the exposed portion.

I claim:

1. A noninductive resistor comprising a supply line having an electrical terminal at its one end;

a return line having an electrical terminal at its one end; said ends being adjacently located with respect to each other; 7

each of said supply and return lines respectively having ends remote from said terminal ends, said remote ends being integrally and electrically connected together;

said supply and return lines being equally dimensioned and extending from said remote ends to said terminal ends twisted together in spaced abutting relation to provide the same twist pitch for each said supply and return line;

said twisted-together supply and return lines having said abutting relation at spaced areas to provide direct contact between said lines thereat, and a cross-sectional plane through said areas being absent of any central open area;

said supply and return lines having an insulating coating thereon with part of said coating removed to provide an exposed area on said lines; means having relative movement with respect to said exposed area to "provide a resistance adjustment of the resistor; and said twisted lines being wound in toroidal form about a base element.

which said relative movement means comprises a slidable arm. 

1. A noninductive resistor comprising a supply line having an electrical terminal at its one end; a return line having an electrical terminal at its one end; said ends being adjacently located with respect to each other; each of said supply and return lines respectively having ends remote from said terminal ends, said remote ends being integrally and electrically connected together; said supply and return lines being equally dimensioned and extending from said remote ends to said terminal ends twisted together in spaced abutting relation to provide the same twist pitch for each said supply and return line; said twisted-together supply and return lines having said abutting relation at spaced areas to provide direct contact between said lines thereat, and a cross-sectional plane through said areas being absent of any central open area; said supply and return lines having an insulating coating thereon with part of said coating removed to provide an exposed area on said lines; means having relative movement with respect to said exposed area to provide a resistance adjustment of the resistor; and said twisted lines being wound in toroidal form about a base element.
 2. A noninductive resistor according to claim 1 in which said base element has an edge surface on which said lines are wound, and spaced parts of said insulating coating located along said surface within said toroidal winding are removed to form said exposed area.
 3. A noninductive resistor according to claim 1 in which said relative movement means comprises a slidable arm. 